Describe the exact player state
Write down the video title and whether you opened it on Dailymotion or inside another publisher’s page. Then inspect the player: is there a subtitle option, is it unavailable, or does it open a language list that lacks your preferred language? A support note using one of those descriptions is more precise than saying subtitles do not work.
Dailymotion’s viewer help says the available languages depend on what the video owner has added. Its control reference separately describes an unavailable subtitle icon when subtitles are not available. The language you want should therefore be checked for the exact item, rather than assumed from the language of the surrounding website.
Use the documented control for the viewing route
For the Android or iOS app, the current subtitle help directs viewers to the three-dot control and the subtitle toggle. For web and mobile browsers, it describes the player’s settings, then Subtitles and the available language choice. Follow the route in front of you rather than looking for the website’s gear menu in every app.
If the video is embedded elsewhere, Dailymotion’s publisher documentation adds another possibility: the publisher can hide the subtitle feature from player controls. That configuration is different from the video owner having supplied no language track. A missing button alone cannot settle which condition applies.
Compare references without losing the item identity
Where an ordinary direct-video link is supplied, keep it with the host-page reference and compare the same item there. Record whether the control or language list differs. If the items have different titles or versions, resolve that identity difference before treating the comparison as evidence about one recording.
For an accessibility enquiry, state the language needed, the exact item and the route where the option is missing or unavailable. Include the distinction between control visibility and track availability in the question. That gives the publishing organisation a concrete presentation or content issue to investigate while avoiding an unsupported promise that changing the device’s menu language can create a subtitle track.